mx2.scrtc.com has no NS records.
NS records for this zone are defined at scrtc.com.
NS records for this zone are defined at scrtc.com.
Question and response
Question
dig mx2.scrtc.com. NS
Answer
The response has no answer records.
Authority
scrtc.com. 3600 SOA ns1.scrtc.com. adminblue.scrtc.com. 520800407 1200 180 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0